Document Detail

Habitat-specific foraging and sex determine mercury concentrations in sympatric benthic and limnetic ecotypes of threespine stickleback.
MedLine Citation:
PMID:  23456641     Owner:  NLM     Status:  MEDLINE    
Mercury (Hg) is a widespread environmental contaminant known for the neurotoxicity of its methylated forms, especially monomethylmercury, which bioaccumulates and biomagnifies in aquatic food webs. Mercury bioaccumulation and biomagnification rates are known to vary among species utilizing different food webs (benthic vs limnetic) within and between systems. The authors assessed whether carbon and nitrogen stable isotope values and total Hg (THg) concentrations differed between sympatric benthic and limnetic ecotypes and sexes of threespine stickleback fish (Gasterosteus aculeatus) from Benka Lake, Alaska, USA. The mean THg concentration in the limnetic ecotype was significantly higher (difference between benthic and limnetic means equals 26 mg/kg dry wt or 16.1%) than that of the benthic ecotype. Trophic position and benthic carbon percentage utilized were both important determinants of THg concentration; however, the 2 variables were of approximately equal importance in females, whereas trophic position clearly explained more of the variance than benthic carbon percentage in males. Additionally, strong sex effects (mean difference between females and males equals 45 mg/kg dry wt or 29.4%) were observed in both ecotypes, with female fish having lower THg concentrations than males. These results indicate that trophic ecology and sex are both important determinants of Hg contamination even within a single species and lake and likely play a role in governing Hg concentrations in higher trophic levels.
James J Willacker; Frank A von Hippel; Kerri L Ackerly; Todd M O'Hara
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2013-05-10
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  32     ISSN:  1552-8618     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-06-04     Completed Date:  2013-08-01     Revised Date:  2014-07-02    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1623-30     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 SETAC.
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MeSH Terms
Feeding Behavior
Food Chain
Lakes / chemistry
Mercury / analysis,  metabolism*
Sex Factors
Smegmamorpha / metabolism*
Water Pollutants, Chemical / analysis,  metabolism*
Grant Support
Reg. No./Substance:
0/Water Pollutants, Chemical; FXS1BY2PGL/Mercury

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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